选取两种典型铸造高温合金DD407及K480,研究其固溶及时效过程中γ’相析出行为.结果表明,经热力学平衡相图计算获知,铸造高温合金K480及DD407合金的凝固温度范围是158、30℃,室温下γ’相体积分数分别为54％,80％;合金在凝固或固溶后的冷却过程中,γ’相形核率低,长大速率高,γ’相粒子易于长大;当其尺寸超过临界尺寸就会发生分解;两合金经过固溶后,较大尺寸的一次γ’相溶解后重新析出较小的二次γ’相;在一次时效空冷热处理后,合金在立方状的二次γ’相通道周围析出弥散细小球形三次γ’相;经过二次时效后,三次γ’相回溶、扩散直至消失,同时二次γ’相进一步长大,立方度增加.
参考文献
| [1] | 胡壮麒,刘丽荣,金涛,孙晓峰.镍基单晶高温合金的发展[J].航空发动机,2005(03):1-7. |
| [2] | Nathal M V;Mackay R A;Miner R V .Influence of precipitate morphology on intermediate temperature creep properties of a nickel-base superalloy single crystal[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1989,20(01):133-141. |
| [3] | 姚志浩,董建新,陈旭,张麦仓,郑磊.GH738高温合金长期时效过程中γ'相演变规律[J].材料热处理学报,2013(01):31-37. |
| [4] | 姚志浩,董建新,张麦仓.GH738高温合金热变形过程显微组织控制与预测Ⅰ.组织演化模型的构建[J].金属学报,2011(12):1581-1590. |
| [5] | 姚志浩,王秋雨,张麦仓,董建新.GH738高温合金热变形过程显微组织控制与预测Ⅱ.组织演化模型验证与应用[J].金属学报,2011(12):1591-1599. |
| [6] | Mukherji D;Rosler J .Effect of the γ' volume fraction on the creep strength of Ni-base superalloys[J].Zeitschrift für Metallkunde,94(05):478-484. |
| [7] | Footner P K;Rihards B P .Long term growth of superalloy γ' particles[J].Journal of Materials Science,1982,17:2141-2153. |
| [8] | Ges A.;Palacio F.;Fornaro O. .LONG TERM COARSENING OF GAMMA' PRECIPITATES IN A NI-BASE SUPERALLOY[J].Journal of Materials Science,1997(14):3687-3691. |
| [9] | ERCAN BALIKCI .Influence of Various Heat Treatments on the Microstructure of Polycrystalline IN738LC[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1997(10):1993-2003. |
| [10] | E. BALIKCI;A. RAMAN .Characteristics of the γ′ precipitates at high temperatures in Ni-base polycrystalline superalloy IN738LC[J].Journal of Materials Science,2000(14):3593-3597. |
| [11] | Baldan A. .Review Progress in Ostwald ripening theories and their applications to the gamma '-precipitates in nickel-base superalloys - Part II - Nickel-base superalloys [Review][J].Journal of Materials Science,2002(12):2379-2405. |
| [12] | Mackay R A;Ebert L J.The development of γ-γ' lamellar structures in a nickel-base superalloy during elevated temperature mechanical testing[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1985(16):1969-1982. |
| [13] | Malow T;Jiawei Zhu;Rajeshwar Prasad Wahi .Influence of heat treatment on the microstructure of the single-crystal nickel-base superalloy SC16[J].Journal of Metallurgical,1994,85(01):9-19. |
| [14] | Soucail M;Bienvenu Y .Dissolution of the γ' in a nickel base superalloy at equilibrium and under rapid heating[J].Rare Metal Materials and Engineering,1996,220:215-222. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%